ListenBucketNotificationAsync Test1, Test2 and Test3` needs to be cleaned up.

[ebozduman]

The following 2 functional tests needs to be cleaned up:

• ListenBucketNotificationAsync_Test2
  &
• ListenBucketNotificationAsync_Test3

First of all, they are not async methods, so the word Async needs to be removed from the names.
Second, there are unused/unnecessary code that can be cleaned up as it is done in PR #1130 for test ListenBucketNotificationAsync_Test1.

Last, we also need to remove the calls to Task.Delay(N) where the N is the wait time in milliseconds.
At this point, values of N are arbitrarily chosen in our code. Instead, we can make it like a wait loop with a time-out value, where we check the status of the task or object, whatever we are waiting for in each step, and keep checking and waiting until the expected happens.